The lineage that produced chimpanzees and humans split from other primates roughly 30 million years ago. chimpanzees' skulls have the following features: trait a, found in fossils as old as 10 to 12 million is molars with thick enamel. trait b, found in fosssils as old as 55 million years, is a postorbital wall that ventrally separates the orbit from the temporal fossa. which of the following statements is true?

a. trait a is more beneficial for chimpanzee survival because it is newer.
b. trait b is more beneficial for chimpanzee survival because it is older.
c. trait a is more likely to be widespread among other primate species because it is newer.
d. trait b is more likely to be widespread among other primate species because it is older submit